package com.xyh.gulimall.order.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.xyh.common.exception.NoStockException;
import com.xyh.common.to.mq.OrderTo;
import com.xyh.common.to.mq.SeckillOrderTo;
import com.xyh.common.utils.R;
import com.xyh.common.vo.MemberRespVo;
import com.xyh.gulimall.order.constant.OrderConstant;
import com.xyh.gulimall.order.dao.OrderItemDao;
import com.xyh.gulimall.order.entity.OrderItemEntity;
import com.xyh.gulimall.order.entity.PaymentInfoEntity;
import com.xyh.gulimall.order.enume.OrderStatusEnum;
import com.xyh.gulimall.order.feign.CartFeignService;
import com.xyh.gulimall.order.feign.MemberFeignService;
import com.xyh.gulimall.order.feign.ProductFeignService;
import com.xyh.gulimall.order.feign.WmsFeignService;
import com.xyh.gulimall.order.interceptor.LoginUserInterceptor;
import com.xyh.gulimall.order.service.OrderItemService;
import com.xyh.gulimall.order.service.PaymentInfoService;
import com.xyh.gulimall.order.to.OrderCreateTo;
import com.xyh.gulimall.order.vo.*;
import io.seata.spring.annotation.GlobalTransactional;
import org.springframework.amqp.AmqpException;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.util.*;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.xyh.common.utils.PageUtils;
import com.xyh.common.utils.Query;

import com.xyh.gulimall.order.dao.OrderDao;
import com.xyh.gulimall.order.entity.OrderEntity;
import com.xyh.gulimall.order.service.OrderService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;

import javax.annotation.Resource;


@Service("orderService")
public class OrderServiceImpl extends ServiceImpl<OrderDao, OrderEntity> implements OrderService {
    private ThreadLocal<OrderSubmitVo> confirmVoThreadLocal = new ThreadLocal<>();

    @Autowired
    OrderItemService orderItemService;

    @Autowired
    MemberFeignService memberFeignService;

    @Autowired
    CartFeignService cartFeignService;

    @Autowired
    WmsFeignService wmsFeignService;

    @Autowired
    ThreadPoolExecutor executor;

    @Autowired
    StringRedisTemplate redisTemplate;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    PaymentInfoService paymentInfoService;

    @Override
    public void createSeckillOrder(SeckillOrderTo seckillOrder) {
        //TODO 保存订单信息
        OrderEntity orderEntity = new OrderEntity();
        orderEntity.setOrderSn(seckillOrder.getOrderSn());
        orderEntity.setMemberId(seckillOrder.getMemberId());

        orderEntity.setStatus(OrderStatusEnum.CREATE_NEW.getCode());

        BigDecimal multiply = seckillOrder.getSeckillPrice().multiply(new BigDecimal("" + seckillOrder.getNum()));

        orderEntity.setPayAmount(multiply);

        this.save(orderEntity);

        //TODO 保存订单项信息
        OrderItemEntity orderItemEntity = new OrderItemEntity();
        orderItemEntity.setOrderSn(seckillOrder.getOrderSn());
        orderItemEntity.setRealAmount(multiply);

        orderItemEntity.setSkuQuantity(seckillOrder.getNum());

        orderItemService.save(orderItemEntity);
    }

    /**
     * 处理支付宝的支付结果
     * @param vo
     * @return
     */
    @Override
    public String handlePayResult(PayAsyncVo vo) {
        //1.保存交易流水
        PaymentInfoEntity infoEntity = new PaymentInfoEntity();
        infoEntity.setAlipayTradeNo(vo.getTrade_no());
        infoEntity.setOrderSn(vo.getOut_trade_no());
        infoEntity.setPaymentStatus(vo.getTrade_status());
        infoEntity.setCallbackTime(vo.getNotify_time());

        paymentInfoService.save(infoEntity);

        //2.修改订单的状体信息
        if (vo.getTrade_status().equals("TRADE_SUCCESS") || vo.getTrade_status().equals("TRADE_FINISHED")){
            //支付成功状态
            String outTradeNo = vo.getOut_trade_no();
            this.updateOrderStatus(outTradeNo,OrderStatusEnum.PAYED.getCode());
        }
        return null;
    }

    private void updateOrderStatus(String outTradeNo, Integer code) {
        baseMapper.updateOrderStatus(outTradeNo,code);
    }

    @Override
    public PageUtils queryPageWithItem(Map<String, Object> params) {
        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();

        IPage<OrderEntity> page = this.page(
                new Query<OrderEntity>().getPage(params),
                new QueryWrapper<OrderEntity>().eq("member_id",memberRespVo.getId()).orderByDesc("id")
        );
        List<OrderEntity> collect = page.getRecords().stream().map(order -> {
            List<OrderItemEntity> itemEntities = orderItemService.list(new QueryWrapper<OrderItemEntity>().eq("order_sn", order.getOrderSn()));
            order.setItemEntities(itemEntities);
            return order;
        }).collect(Collectors.toList());

        page.setRecords(collect);
        return new PageUtils(page);
    }

    /**
     * 获取当前订单的支付信息
     * @param orderSn
     * @return
     */
    @Override
    public PayVo getOrderPay(String orderSn) {
        PayVo payVo = new PayVo();
        OrderEntity order = this.getOrderByOrderSn(orderSn);
        payVo.setTotal_amount(order.getPayAmount().setScale(2,BigDecimal.ROUND_UP).toString());
        payVo.setOut_trade_no(order.getOrderSn());

        List<OrderItemEntity> order_sn = orderItemService.list(new QueryWrapper<OrderItemEntity>().eq("order_sn", orderSn));
        OrderItemEntity entity = order_sn.get(0);
        payVo.setSubject(entity.getSkuName());
        payVo.setBody(entity.getSkuAttrsVals());
        return payVo;
    }

    @Override
    public void closeOrder(OrderEntity entity) {
        //查询当前这个订单的最新状态
        OrderEntity orderEntity = this.getById(entity.getId());
        if (orderEntity.getStatus() == OrderStatusEnum.CREATE_NEW.getCode()){
            //关单
            OrderEntity update = new OrderEntity();
            update.setId(entity.getId());
            orderEntity.setStatus(OrderStatusEnum.CANCLED.getCode());
            this.updateById(update);
            OrderTo orderTo = new OrderTo();
            BeanUtils.copyProperties(orderEntity,orderTo);
            //发给MQ一个
            try {
                //TODO 保证消息一定会发送出去,每一个消息都可以做好日志记录（给数据库保存每一个消息的详细信息）
                //TODO 定期扫描数据库将失败的消息再发送一遍
                rabbitTemplate.convertAndSend("order-event-exchange","order.release.other",orderTo);
            } catch (AmqpException e) {
                //TODO 将没法发送成功的消息进行重试发送

            }
        }
    }

    @Override
    public OrderEntity getOrderByOrderSn(String orderSn) {
        return this.getOne(new QueryWrapper<OrderEntity>().eq("order_sn",orderSn));
    }

    /**
     * 下单
     */
//    @GlobalTransactional
    @Transactional
    @Override
    public SubmitOrderResponseVo submitOrder(OrderSubmitVo vo) {
        confirmVoThreadLocal.set(vo);
        SubmitOrderResponseVo response = new SubmitOrderResponseVo();
        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();
        response.setCode(0);
        //1.验证令牌【令牌的对比和删除必须保证原子性】
        //0令牌失败 / 1删除成功
        String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
        String orderToken = vo.getOrderToken();
        //用lua脚本原子验证和删除令牌
        Long result = redisTemplate.execute(new DefaultRedisScript<Long>(script, Long.class), Arrays.asList(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId()), orderToken);
        if (result == 0L){
            //令牌验证失败
            response.setCode(1);
            return response;
        }else {
            //令牌验证成功
            //下单：去创建订单，验令牌，验价格，锁库存...
            //1.创建订单，订单项等信息
            OrderCreateTo order = createOrder();
            //2.验价
            BigDecimal payAmount = order.getOrder().getPayAmount();
            BigDecimal payPrice = vo.getPayPrice();
            if (Math.abs(payAmount.subtract(payPrice).doubleValue()) < 0.01){
                //金额对比成功
                //TODO 3.保存订单
                savaOrder(order);
                //4.库存锁定,只要有异常，回滚订单数据。
                // 订单号，所有订单项（skuId,skuName,num）
                WareSkuLockVo lockVo = new WareSkuLockVo();
                lockVo.setOrderSn(order.getOrder().getOrderSn());
                List<OrderItemVo> locks = order.getOrderItems().stream().map(item -> {
                    OrderItemVo itemVo = new OrderItemVo();
                    itemVo.setSkuId(item.getSkuId());
                    itemVo.setCount(item.getSkuQuantity());
                    itemVo.setTitle(item.getSkuName());
                    return itemVo;
                }).collect(Collectors.toList());
                lockVo.setLocks(locks);
                //TODO 4.远程锁库存
                //为了保证高并发，库存服务自己回滚，可以发消息给库存服务
                //库存服务本身也可以使用自动解锁模式，用mq的延时队列做
                R r = wmsFeignService.orderLockStock(lockVo);
                if (r.getCode() == 0){
                    //锁成功了
                    response.setOrder(order.getOrder());
                    //TODO 5.远程扣减积分
                    //TODO 订单创建成功，发送消息给mq
                    rabbitTemplate.convertAndSend("order-event-exchange","order.create.order",order.getOrder());
                    return response;
                }else {
                    //锁失败了
//                    throw new NoStockException(msg);
                    response.setCode(3);
                    return response;
                }
            }else {
                //金额对比失败
                response.setCode(2);
                return response;
            }
        }
//        String redisToken = redisTemplate.opsForValue().get(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId());
//        if (orderToken != null && orderToken.equals(redisToken)){
//            //令牌验证通过
//            redisTemplate.delete(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId());
//        }else {
//            //不通过
//        }
    }

    /**
     * 保存订单数据
     * @param order
     */
    private void savaOrder(OrderCreateTo order) {
        OrderEntity orderEntity = order.getOrder();
        orderEntity.setModifyTime(new Date());
        this.save(orderEntity);

        List<OrderItemEntity> orderItems = order.getOrderItems();
        orderItemService.saveBatch(orderItems);
    }

    private OrderCreateTo createOrder(){
        OrderCreateTo createTo = new OrderCreateTo();
        //1.生成订单号
        String orderSn = IdWorker.getTimeId();
        //创建订单号
        OrderEntity orderEntity = buildOrder(orderSn);

        //2.获取所有的订单项
        List<OrderItemEntity> itemEntities = buildOrderItems(orderSn);

        //3.计算价格相关数据
        computePrice(orderEntity,itemEntities);
        createTo.setOrder(orderEntity);
        createTo.setOrderItems(itemEntities);
        return createTo;
    }

    private void computePrice(OrderEntity orderEntity, List<OrderItemEntity> itemEntities) {
        //订单总额,计算各种优惠的总额,计算积分和成长值总额
        BigDecimal couponAmount = new BigDecimal("0.0");
        BigDecimal promotionAmount = new BigDecimal("0.0");
        BigDecimal integrationAmount = new BigDecimal("0.0");
        Integer integration = 0;
        Integer growth = 0;
        BigDecimal total = new BigDecimal("0.0");
        for (OrderItemEntity entity : itemEntities) {
            couponAmount = couponAmount.add(entity.getCouponAmount());
            promotionAmount = promotionAmount.add(entity.getPromotionAmount());
            integrationAmount = integrationAmount.add(entity.getIntegrationAmount());
            growth += entity.getGiftGrowth();
            integration += entity.getGiftIntegration();
            total = total.add(entity.getRealAmount());
        }
        orderEntity.setTotalAmount(total);

        orderEntity.setPayAmount(total.add(orderEntity.getFreightAmount()));
        orderEntity.setPromotionAmount(promotionAmount);
        orderEntity.setCouponAmount(couponAmount);
        orderEntity.setIntegrationAmount(integrationAmount);

        orderEntity.setGrowth(growth);
        orderEntity.setIntegration(integration);
        orderEntity.setDeleteStatus(0);  //未删除
    }

    private OrderEntity buildOrder(String orderSn) {
        MemberRespVo respVo = LoginUserInterceptor.loginUser.get();
        OrderEntity entity = new OrderEntity();
        entity.setOrderSn(orderSn);
        entity.setMemberId(respVo.getId());

        OrderSubmitVo submitVo = confirmVoThreadLocal.get();
        //获取收货信息
        R fare = wmsFeignService.getFare(submitVo.getAddrId());
        FareVo fareResp = fare.getData(new TypeReference<FareVo>() {
        });
        //设置运费信息
        entity.setFreightAmount(fareResp.getFare());
        //设置收获人信息
        entity.setReceiverCity(fareResp.getAddress().getCity());
        entity.setReceiverDetailAddress(fareResp.getAddress().getDetailAddress());
        entity.setReceiverName(fareResp.getAddress().getName());
        entity.setReceiverPhone(fareResp.getAddress().getPhone());
        entity.setReceiverPostCode(fareResp.getAddress().getPostCode());
        entity.setReceiverProvince(fareResp.getAddress().getProvince());
        entity.setReceiverRegion(fareResp.getAddress().getRegion());

        //设置订单的相关状态信息
        entity.setStatus(OrderStatusEnum.CREATE_NEW.getCode());
        entity.setAutoConfirmDay(7);
        return entity;
    }

    /**
     * 构建所有订单项数据
     * @return
     */
    private List<OrderItemEntity> buildOrderItems(String orderSn) {
        //最后确定每个购物项价格
        List<OrderItemVo> currentUserCartItems = cartFeignService.getCurrentUserCartItems();
        if (currentUserCartItems != null && currentUserCartItems.size() > 0){
            List<OrderItemEntity> itemEntities = currentUserCartItems.stream().map(cartItem -> {
                OrderItemEntity itemEntity = buildOrderItem(cartItem);
                itemEntity.setOrderSn(orderSn);
                return itemEntity;
            }).collect(Collectors.toList());
            return itemEntities;
        }
        return null;
    }

    /**
     * 构建每一个订单项
     * @param cartItem
     * @return
     */
    private OrderItemEntity buildOrderItem(OrderItemVo cartItem) {
        OrderItemEntity itemEntity = new OrderItemEntity();
        //1.订单信息，订单号
        //2.商品的SPU信息
        Long skuId = cartItem.getSkuId();
        R r = productFeignService.getSpuInfoBySkuId(skuId);
        SpuInfoVo data = r.getData(new TypeReference<SpuInfoVo>() {
        });
        itemEntity.setSpuId(data.getId());
        itemEntity.setSpuBrand(data.getBrandId().toString());
        itemEntity.setSpuName(data.getSpuName());
        itemEntity.setCategoryId(data.getCatalogId());
        //3.商品的sku信息
        itemEntity.setSkuId(cartItem.getSkuId());
        itemEntity.setSkuName(itemEntity.getSkuName());
        itemEntity.setSkuPic(itemEntity.getSkuPic());
        itemEntity.setSkuPrice(itemEntity.getSkuPrice());
        String skuAttr = StringUtils.collectionToDelimitedString(cartItem.getSkuAttr(), ";");
        itemEntity.setSkuAttrsVals(skuAttr);
        itemEntity.setSkuQuantity(cartItem.getCount());
        //4.优惠信息（不做）
        //5.积分信息
        itemEntity.setGiftGrowth(cartItem.getPrice().multiply(new BigDecimal(cartItem.getCount().toString())).intValue());
        itemEntity.setGiftIntegration(cartItem.getPrice().multiply(new BigDecimal(cartItem.getCount().toString())).intValue());
        //6.订单项的价格信息
        itemEntity.setPromotionAmount(BigDecimal.ZERO);
        itemEntity.setCouponAmount(BigDecimal.ZERO);
        itemEntity.setIntegrationAmount(BigDecimal.ZERO);
        //当前订单项的实际金额 总额 - 各种优惠
        BigDecimal orign = itemEntity.getSkuPrice().multiply(new BigDecimal(itemEntity.getSkuQuantity().toString()));
        BigDecimal subtract = orign.subtract(itemEntity.getCouponAmount())
                .subtract(itemEntity.getPromotionAmount())
                .subtract(itemEntity.getIntegrationAmount());

        itemEntity.setRealAmount(subtract);
        return itemEntity;
    }

    @Override
    public OrderConfirmVo confirmOrder() throws ExecutionException, InterruptedException {
        OrderConfirmVo confirmVo = new OrderConfirmVo();
        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();

        //获取之前的请求
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();

        CompletableFuture<Void> getAddressFuture = CompletableFuture.runAsync(() -> {
            //1.远程查询所有的收货地址列表
            //每一个线程都来共享之前的请求数据
            RequestContextHolder.setRequestAttributes(requestAttributes);
            List<MemberAddressVo> address = memberFeignService.getAddress(memberRespVo.getId());
            confirmVo.setAddress(address);
        }, executor);

        CompletableFuture<Void> cartFuture = CompletableFuture.runAsync(() -> {
            //2.远程查询购物车所有选中的购物项
            RequestContextHolder.setRequestAttributes(requestAttributes);
            List<OrderItemVo> items = cartFeignService.getCurrentUserCartItems();
            confirmVo.setItems(items);
        }, executor).thenRunAsync(()->{
            List<OrderItemVo> items = confirmVo.getItems();
            List<Long> collect = items.stream().map(item -> item.getSkuId()).collect(Collectors.toList());

            R hasStock = wmsFeignService.getSkusHasStock(collect);
            List<SkuStockVo> data = hasStock.getData(new TypeReference<List<SkuStockVo>>() {
            });
            if (data != null){
                Map<Long, Boolean> map = data.stream().collect(Collectors.toMap(SkuStockVo::getSkuId, SkuStockVo::getHasStock));
                confirmVo.setStocks(map);
            }
        });

        //3.查询用户积分
        Integer integration = memberRespVo.getIntegration();
        confirmVo.setIntegration(integration);

        //4.其他数据自动计算

        //TODO 5.防重令牌
        String token = UUID.randomUUID().toString().replace("-", "");

        confirmVo.setOrderToken(token);
        redisTemplate.opsForValue().set(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId(),token,30, TimeUnit.MINUTES);

        CompletableFuture.allOf(getAddressFuture,cartFuture).get();
        return confirmVo;
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<OrderEntity> page = this.page(
                new Query<OrderEntity>().getPage(params),
                new QueryWrapper<OrderEntity>()
        );

        return new PageUtils(page);
    }

}